Jimmys66:
You can go with a 347 AND have less than 500hp AND run less than 12 sec.
A good short block, AFR185 or Twisted Wedge heads, cam in the 230 @.050" intake and 6-10 more exhaust, 650-750 tuned carb, Vic Jr. intake, long tube headers and full 2 1/2" exhaust. It can be done with 3.55...